import React, { Component } from 'react'
import avatar from './images/avatar.png'
import dayjs from 'dayjs'

export default class App extends Component {
  state = {
    // #1 准备变量
    comment: '',
    // hot: 热度排序  time: 时间排序
    tabs: [
      {
        id: 1,
        name: '热度',
        type: 'hot',
      },
      {
        id: 2,
        name: '时间',
        type: 'time',
      },
    ],
    active: 'time',
    list: [
      {
        id: 1,
        author: '刘德华',
        comment: '给我一杯忘情水',
        time: '2021-11-10 09:09:00',
        img: 'https://y.qq.com/music/photo_new/T001R300x300M000003aQYLo2x8izP.jpg?max_age=2592000',
        // 1: 点赞 0：无态度 -1:踩
        attitude: 1,
      },
      {
        id: 2,
        author: '周杰伦',
        comment: '听妈妈的话',
        time: '2021-12-11 09:09:00',
        img: 'https://y.qq.com/music/photo_new/T001R500x500M0000025NhlN2yWrP4.jpg?max_age=2592000',
        // 1: 点赞 0：无态度 -1:踩
        attitude: 0,
      },
      {
        id: 3,
        author: '陈奕迅',
        comment: '十年',
        time: '2021-10-11 10:09:00',
        img: 'https://y.qq.com/music/photo_new/T001R500x500M000003Nz2So3XXYek.jpg?max_age=2592000',
        // 1: 点赞 0：无态度 -1:踩
        attitude: -1,
      },
    ],
  }
  // 原型
  handleTabChange(active) {
    // this => 实例
    return () => {
      this.setState({
        active,
      })
    }
  }
  // 实例
  /* handleTabChange = (active) => {
    // this => 实例
    return () => {
      this.setState({
        active,
      })
    }
  } */
  handleDel = (id) => {
    // 保留的是不等于这个 id
    this.setState({
      list: this.state.list.filter((item) => item.id !== id),
    })
  }
  handleZan(id, attitude) {
    this.setState({
      list: this.state.list.map((item) => {
        if (item.id === id) {
          // 找到了要修改的那一项，只改 attribute
          return {
            ...item,
            attitude,
          }
        } else {
          /* return {
            ...item,
          } */
          return item
        }
      }),
    })
  }
  renderList() {
    const { list } = this.state
    return list.length === 0 ? (
      <h3>暂无评论</h3>
    ) : (
      list.map((item) => (
        <div className='list-item' key={item.id}>
          <div className='user-face'>
            <img className='user-head' src={item.img} alt='' />
          </div>
          <div className='comment'>
            <div className='user'>{item.author}</div>
            <p className='text'>{item.comment}</p>
            <div className='info'>
              <span className='time'>{item.time}</span>
              {/* 如果是 1，表示已经赞了，再点一下，期望变成 0 来取消点赞，否则应该是 1 来点赞 */}
              <span
                className={item.attitude === 1 ? 'like liked' : 'like'}
                onClick={() =>
                  this.handleZan(item.id, item.attitude === 1 ? 0 : 1)
                }
              >
                <i className='icon'></i>
              </span>
              {/* 如果是 -1，表示已经踩了，再点一下，期望变成 0 来取消踩，否则应该是 -1 来踩 */}
              <span
                className={item.attitude === -1 ? 'hate hated' : 'hate'}
                onClick={() =>
                  this.handleZan(item.id, item.attitude === -1 ? 0 : -1)
                }
              >
                <i className='icon'></i>
              </span>
              <span
                className='reply btn-hover'
                onClick={() => this.handleDel(item.id)}
              >
                删除
              </span>
            </div>
          </div>
        </div>
      ))
    )
  }
  handleChange = (e) => {
    this.setState({
      comment: e.target.value,
    })
  }
  handleSubmit = () => {
    if (this.state.comment.trim().length === 0) {
      return alert('不能为空')
    }
    // 把输入的内容加工成对象
    const newComment = {
      id: Date.now(),
      author: 'Ifer',
      comment: this.state.comment,
      time: dayjs(new Date()).format('YYYY-MM-DD HH:mm:ss'), // Objects are not valid as a React child
      img: avatar,
      // 1: 点赞 0：无态度 -1:踩
      attitude: 0,
    }
    // 不符合状态的不可变性
    // this.state.list.push(newComment)
    this.setState({
      list: [newComment, ...this.state.list],
      comment: '', // 清空输入的内容
    })
  }
  render() {
    const { list, tabs, active, comment } = this.state
    return (
      <div className='App'>
        <div className='comment-container'>
          <div className='comment-head'>
            <span>{list.length} 评论</span>
          </div>
          <div className='tabs-order'>
            <ul className='sort-container'>
              {tabs.map((item) => (
                <li
                  className={item.type === active ? 'on' : ''}
                  key={item.id}
                  onClick={this.handleTabChange(item.type)}
                >
                  按{item.name}排序
                </li>
              ))}
            </ul>
          </div>
          <div className='comment-send'>
            <div className='user-face'>
              <img className='user-head' src={avatar} alt='' />
            </div>
            <div className='textarea-container'>
              <textarea
                cols='80'
                rows='5'
                placeholder='发条友善的评论'
                className='ipt-txt'
                value={comment}
                onChange={this.handleChange}
              ></textarea>
              <button className='comment-submit' onClick={this.handleSubmit}>
                发表评论
              </button>
            </div>
            <div className='comment-emoji'>
              <i className='face'></i>
              <span className='text'>表情</span>
            </div>
          </div>
          <div className='comment-list'>{this.renderList()}</div>
        </div>
      </div>
    )
  }
}
